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Classic Camera Repair » Archives-2009 » Repair help Canon EF 28-80mm f/2.8-4 L USM « Previous Next »

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Harm1
Tinkerer
Username: Harm1

Post Number: 1
Registered: 10-2009

Rating: N/A
Votes: 0 (Vote!)

Posted on Monday, October 12, 2009 - 12:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)
I've changed the electronics for a 'dead' Canon EF 28-80mm f/2.8-4 L USM lens. Now the lens has proper aperture reaction but focus is still wrong but active now.

I think the electronics need adjustement!
Does anyone know how to adjust the EF 28-80mm lens? I've the parts manual for this lens but that doesn't tell anything about adjustment.

Thanks for help!
Harm
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Glenn
Tinkerer
Username: Glenn

Post Number: 683
Registered: 07-2006

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Posted on Monday, October 12, 2009 - 01:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)
I doubt you will find much information about your lens on this forum - far too modern to be rated Classic. I have worked on this range of canon lenses, but I am not even going to suggest a route/remedy for you to follow - there were/are a number of design modifications through the production run and messing about can lead to a very dead optic!

Search the websites that deal with the modern EF mount Canon ranges - there is a USM repair manual somewhere out there, but I seem to recall that it was generic rather than type specific. One reason why I did not bookmark, the other reason being that the modular electronics are not amenable to DIY - sure you can change the module, but adjustment is not always easy or possible. An accredited repair agent will have all the required parts to hand, so I have my modern kit serviced by the factory agents.

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